Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
tang sach » mang sach, nang sach, tvqg sach
sang sach » mang sach, ban sach, sang tac
tran tuan » tran xuan, tran quang, tran thanh
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tang sach) or (sang sach)) - thanh tran tuan dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tang sach) OR (sang sach)) - thanh tran tuan dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tang sach) or (sang sach)) - thanh tran tuan dung cong tac toan cau*.